Investigation on the Dielectric Properties of Exfoliated Graphite-Silicon Carbide Nanocomposites and Their Absorbing Capability for the Microwave Radiation

Baskey, Himangshu Bhusan; Singh, Sandeep Kumar; Akhtar, M. Jaleel; Kar, Kamal K.

doi:10.1109/tnano.2017.2682121

Cited by 35 publications

(11 citation statements)

References 42 publications

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“…However, in most cases, the selection of carbides was usually limited to SiC or Ti 3 C 2 Mxenes. It is well known that either SiC or Ti 3 C 2 has very large particle size even up to several microns, which means that these carbides particles cannot fully contact with carbon matrix, and thus, the contribution from interfacial polarization may be insufficient in such carbon/carbide composites [29,32]. More recently, some attempts were made to decorate carbon matrix with some unconventional carbide particles, whose ultrafine particle size could generate good dispersion and abundant interfaces, resulting in a significant enhancement in microwave absorption [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Solvent-Free Synthesis of Ultrafine Tungsten Carbide Nanoparticles-Decorated Carbon Nanosheets for Microwave Absorption

et al. 2020

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HIGHLIGHTS • Ultrafine tungsten carbide nanoparticles-decorated carbon nanosheets were successfully fabricated via a simple solvent-free strategy. • The chemical composition of tungsten carbide/carbon composites can be easily manipulated by the weight ratio of dicyandiamide to ammonium metatungstate. • The advantages in good performance and simple preparation provide a promising prospect for the application of these tungsten carbide/ carbon composites. ABSTRACT Carbides/carbon composites are emerging as a new kind of binary dielectric systems with good microwave absorption performance. Herein, we obtain a series of tungsten carbide/carbon composites through a simple solvent-free strategy, where the solid mixture of dicyandiamide (DCA) and ammonium metatungstate (AM) is employed as the precursor. Ultrafine cubic WC 1−x nanoparticles (3-4 nm) are in situ generated and uniformly dispersed on carbon nanosheets. This configuration overcomes some disadvantages of conventional carbides/carbon composites and is greatly helpful for electromagnetic dissipation. It is found that the weight ratio of DCA to AM can regulate chemical composition of these composites, while less impact on the average size of WC 1−x nanoparticles. With the increase in carbon nanosheets, the relative complex permittivity and dielectric loss ability are constantly enhanced through conductive loss and polarization relaxation. The different dielectric properties endow these composites with distinguishable attenuation ability and impedance matching. When DCA/AM weight ratio is 6.0, the optimized composite can produce good microwave absorption performance, whose strongest reflection loss intensity reaches up to − 55.6 dB at 17.5 GHz and qualified absorption bandwidth covers 3.6-18.0 GHz by manipulating the thickness from 1.0 to 5.0 mm. Such a performance is superior to many conventional carbides/carbon composites.

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Section: Introductionmentioning

confidence: 99%

Solvent-Free Synthesis of Ultrafine Tungsten Carbide Nanoparticles-Decorated Carbon Nanosheets for Microwave Absorption

et al. 2020

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“…The development of a microwave absorbing material (MAM) is directly related with the materials engineering to provide the current edge requirements of competitively growing civil and military fields. − The electromagnetic pollution caused by vast uses of telecommunication and electronic devices affects severally to the human health and also disturbs proper functioning of nearby electronic devices in the form of an electromagnetic interference (EMI). ,, The known potential of MAMs is to reduce the EMI pollutions, and hence, the investigations involving MAMs are now becoming a hotspot both in civil and military sectors. ,, Usually, in the military fields, the exploration of MAMs is focused in the X band ranging from 8.0–12.0 GHz frequency as RADAR interrogative devices are specially designed to operate in this range. ,, Concerning this, the aim of MAMs is to reduce the range detection, i.e., minimize the RADAR cross section . To achieve this, MAMs are typically coated on the target object, which consists of aircrafts, ships, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon materials like CNTs and graphene are carbon fibers (CFs), which are the most studied exploration topics, and have shown to be significant as MAMs . The low density, high electrical conductivity, and high mechanical strength of CFs give added advantages in preparing MAMs using CFs. , However, due to the long CF length, the dispersion inside the polymer matrix remained a huge problem as it easily agglomerated in the form of a bundle and limited the potential uses. , Therefore, size reduction in the form of milled carbon fiber (MCF) seems to be the sophisticated approach to tackle the agglomeration issues. In addition, recent exploration also disclosed that microwave absorption properties have substantially improved beyond a certain aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

“…1,2,10 Concerning this, the aim of MAMs is to reduce the range detection, i.e., minimize the RADAR cross section. 11 To achieve this, MAMs are typically coated on the target object, which consists of aircrafts, ships, etc. Moreover, the manufacturing point of view of several key parameters concerning MAM designing has to be taken in to consideration.…”

Section: ■ Introductionmentioning

confidence: 99%

“…14 The low density, high electrical conductivity, and high mechanical strength of CFs give added advantages in preparing MAMs using CFs. 11,14 However, due to the long CF length, the dispersion inside the polymer matrix remained a huge problem as it easily agglomerated in the form of a bundle and limited the potential uses. 1,15 Therefore, size reduction in the form of milled carbon fiber (MCF) seems to be the sophisticated approach to tackle the agglomeration issues.…”

Section: ■ Introductionmentioning

confidence: 99%

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Synthesis of a Lightweight Nanocomposite Based on Polyaniline 3D Hollow Spheres Integrated Milled Carbon Fibers for Efficient X-Band Microwave Absorption

Singh

Akhtar

Kar

2020

Ind. Eng. Chem. Res.

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In the present study, the milled carbon fiber (MCF) and conductive polyaniline (PANI) are impregnated in the epoxy matrix to synthesize a lightweight nanocomposite, providing efficient microwave absorption in the X band. The PANI 3D hollow spheres are uniquely synthesized by removing the polystyrene (PS) core structure of PS/PANI composites. The MCF and as-synthesized PANI hollow spheres are characterized by Raman spectroscopy, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). The FESEM analysis confirmed the formation of 3D hollow PANI conductive spheres, which exhibited numerous porosity and high roughness on PANI sphere surfaces. The XRD revealed that the size reduction of carbon fibers down to the micro level resulted into more graphitic carbon. The MCF-and PANI-impregnated epoxy nanocomposites are evaluated by reflectivity measurements for their microwave absorption capabilities, exclusively in the X band. The correlation of the results shows that the ratio of MCF and PANI fillers in the epoxy matrix can be customized to obtain the desired microwave absorption performance of the synthesized nanocomposite. A maximum absorption value of −49.3 dB (99.998% absorption) as well as 1.7 GHz −10 dB effective bandwidth is achieved using a nanocomposite sample of 1.8 mm thickness comprising 4 wt % MCF and 1 wt % PANI filler loadings. The strong microwave absorption in the present situation for a very thin sample using just 5% of the total filler results into quite a lightweight composite, which basically originates from the electric/dipolar polarization in the interfacial polarization dominant in the micron length fibers and hollow 3D PANI spherical structures. The hollow 3D morphology here improves the impedance matching of the resulting nanocomposite sample due to multiple reflections and scattering of EM waves inside the structure, which substantially increases the reflection loss of EM waves in the specified frequency band. The novelty of this work lies in synthesizing the PANI/MCF-based filler for the first time and using it to develop a lightweight nanocomposite, which is found to be quite an efficient microwave absorber, especially for X band applications.

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Optical Revolution with Sustainable Energy Framework

Nigam

Kar

2023

Springer Series in Materials Science

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Investigation on the Dielectric Properties of Exfoliated Graphite-Silicon Carbide Nanocomposites and Their Absorbing Capability for the Microwave Radiation

Cited by 35 publications

References 42 publications

Solvent-Free Synthesis of Ultrafine Tungsten Carbide Nanoparticles-Decorated Carbon Nanosheets for Microwave Absorption

Solvent-Free Synthesis of Ultrafine Tungsten Carbide Nanoparticles-Decorated Carbon Nanosheets for Microwave Absorption

Synthesis of a Lightweight Nanocomposite Based on Polyaniline 3D Hollow Spheres Integrated Milled Carbon Fibers for Efficient X-Band Microwave Absorption

Optical Revolution with Sustainable Energy Framework

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